on getProp me,x,y
  v = getaProp(me,x)
  if voidP(v) then alert("Function "&string(x)&" not declared. Please include it.")
  return v[y]
end

on getPropRef me,x,y
  v = getaProp(me,x)
  if voidP(v) then alert("Function "&string(x)&" not declared. Please include it.")
  return v[y]
end